As I wrote on another forum, I was really hoping that one day her foot would be better and that she could be an active member again. While she was never my top favorite, I grew to like her a lot and she was really nice at Anime Expo 2009. I actually wrote her a page for the fanbook given there because she had so few pages.
At least she's staying in H!P.
As for combining her graduation concert with Gaki's, I wish that they could had separate graduations, or have announced Aika's at the same time as Gaki's or something. But it is what it is.